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Friction stir welding method, device and tool set

A friction stir and joining method technology, applied in the fields of friction stir welding and devices and tool sets, can solve the problems of poor joining, high input energy, difficulty in applying surface pressure, etc. The effect of running costs

Inactive Publication Date: 2016-01-20
PRIMETALS TECHNOLOGIES JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the joining of high-melting-point materials exceeding 1000°C, the input energy due to frictional stirring per unit joint length becomes high, and the deformation resistance value also becomes high. Therefore, high heat-resistant strength and fracture toughness are sought for the rotary tool, thereby It is necessary to use expensive materials such as polycrystalline diamond, and there is a problem of poor economy
[0028] Moreover, even if expensive materials such as polycrystalline diamond are used, the life of the tool is shortened due to thermal shock, tool wear, and bending stress acting on the probe, etc., and it becomes a high melting point material that hinders friction stir welding over 1000°C The main reason for the popularity of
If the tool life is shortened, the frequency of tool replacement will increase, and there is a problem of poor economy
[0029] The second is the problem of bad joints
Furthermore, the bonding tool cannot be tilted, and it is difficult to apply the desired surface pressure required for stirring.
If the desired surface pressure required for stirring cannot be applied, the fluidity of the joint portion decreases, causing joint defects.

Method used

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  • Friction stir welding method, device and tool set
  • Friction stir welding method, device and tool set
  • Friction stir welding method, device and tool set

Examples

Experimental program
Comparison scheme
Effect test

example 1～3

[0300] Figure 30It is a diagram showing the relationship between the rotation direction of the rotary tool and the advancing side (advancing side) and the returning side (retreating side). like Figure 30 As shown, the side where the rotating direction of the rotary tool 3 coincides with the friction stir advancing direction (joining direction or tool feeding direction) is called advancing side AS, and the side where the rotating direction of the tool and the friction stirring advancing direction face the opposite direction is called AS. Return side RS.

[0301] ・Example of plate thickness difference 1

[0302] Figure 31 It is a diagram illustrating an example in which no step occurs on the back side (lower surface in the figure) of two metal plates 1 and 2 but a step difference occurs on the front side (upper surface in the figure). At this time, the metal plates 1 and 2 are arranged so that the thicker metal plate 1 becomes the return side RS, and the thinner metal pla...

example 2

[0308] Figure 34 It is a diagram illustrating an example in which no step occurs on the front side (upper surface in the figure) of two metal plates 1 and 2 and a step difference occurs on the back side (lower surface in the figure). At this time, the shape of the pressing force holding surface 4 b of the backing tool 4 is processed so as to correspond to the difference in thickness of the metal plates 1 and 2 (step difference on the back side). That is, the height of the backing tool 4 on the side corresponding to the thin metal plate 2 is higher than the height of the backing tool 4 on the side corresponding to the thick metal plate 1, whereby the pressing force holding surface 4b of the backing tool 4 In contact with the back side of the metal plates 1,2.

[0309] Figure 35 It is a conceptual diagram of the cross-sectional shape of the joined part after joining. exist Figure 34 Friction stir welding is performed in a state where the metal plates 1 and 2 have substant...

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Abstract

In order to perform highly-reliable friction stir welding superior in terms of economy and high in joint strength, a rotary tool 3 includes a tool body 3a having a shoulder surface 3b formed at a tip end portion thereof and a protruding portion 3d formed so as to protrude from the shoulder surface 3b, a backing tool 4 includes a tool body 4a having a pressing force maintaining surface 4b formed at a tip end portion thereof and a recessed portion 4d for receiving a tip end of the protruding portion 3d; the rotary and backing tools 3 and 4 are arranged in opposed relationship on the front and back surface sides of a joint portion J of metal plates; under the state that the backing tool 4 is held, the rotary tool 3 is moved in a direction to approach the backing tool 4 while being rotated; the tip end of the protruding portion 3d of the rotary tool is inserted into the recessed portion 4d of the backing tool 4; the joint portion is sandwiched; the shoulder surface 3b of the rotary tool is pressed against the front surface of the joint portion; and under that state, the rotary tool 3 and the backing tool 4 are moved along the joint portion, and the rotary tool 3 frictionally stirs the joint portion in the entire region in a thickness direction of the plates.

Description

technical field [0001] The present invention relates to a friction stir welding method, device, and tool set for friction stirring and joining joints of metal materials. Background technique [0002] There is known a friction stir welding technique in which the surface of a shoulder portion provided on a tool body of the bonding tool is brought into contact with the surface of a joining member while rotating a bonding tool (rotary tool), and the surface of the shoulder portion is used to Friction stirring is carried out with the frictional heat of the surface of the joining member, and the material is stirred and joined in a solid-phase state at or below the melting point of the joining member. This joining technology mainly uses aluminum alloys and is being put into practical use in various industrial fields. [0003] The conventional friction stir welding technology is roughly divided into one-sided friction stir welding and double-sided friction stir welding. [0004] O...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12
CPCB23K20/1255B23K20/126
Inventor 加贺慎一小野濑满富永宪明斋藤武彦芳村泰嗣平野聪朴胜焕
Owner PRIMETALS TECHNOLOGIES JAPAN LTD